Cinematograph target apparatus.



D. H. GORBIN & A. W. HARRIS. GINEMATOGRAPH TARGET APPARATUS. APPLICATION FILED MAY 16, 1914.

1,125,660, Patented Jan 19,1915.

ArroRrrsY emen l 513$ GIHRBIN AND ARTHUR WILLIAM HARRIS, Q's BIRZYIINGHAM,

CINEMATOGRAPH TARGET AIQPAEA'IJUE.

LANE, AbSIGNOE-S T TARGETS LIMITED, OF LONDON, ENGLAND.

one 2i: may concern:

*nown that we, DoUcLAs Harness srnon WILLIAM HAnnis, subs of Great Britain, residing ngs road Erdington, Birmingham, the county of i l' arwick, England, and

Rene, Jaiiray lioathriEi-dzngton, Biraf-oreseid, respectively, have inneW and useful ln'iproven'ient in sor raph Target Apparatus; and we r, and exact description of the same.

I invention comprises improvements in t graph target apparatus moi-seepely oi the kind which is described in the stente l los. 1027371. moses and cinematographmachines it is cnstomemploy a pair of shutters adapted to ch-t ligh rays so as to cut oil the ire when the film is moving and also -dithering on the screen. Such usually "form parts of a disk, one substantially one third of the disk 2'. e. 1 no side edges of the shutters are at an e of 120 degrees to each other and it is i e this shutter is passing the film that film is moving. The second shutter is smaller, is at a point diametrically rely operating to prevent flickering screen. by cutting oil the light rays a moment corresponding with the middle the exposure of the picture. The flicker between the bright light when the is 'shmdina' stationary upon the and the relatively dark screen when t rays are cut off during the time film is moving. The minor por o the shutter by cutting oil the light 1e middle of the time during which iii-h picture is stationary tend to modify the contrast, and'thus diminish the flickering etograph as in the aforementioned .cr patents it has been necessary to do .ihile the heater-shaft and shutter care i. melting an angelic movement of or 106 degrees which is difiienlt and matoggraph pictures is caused by the o declare the following to be a tall,

et; and in arresting the movement ofthe' Specification ofLettez-s Patent. Patented Jan, 19, 1515.1.

spslieation filed Key is, 191 2.

Serial 2K0. 339,003.

According to the present invention the shutter device is formed in two parts one part being however free upon the'shaft and a second part secured to the shaft rotatable therwxith and connected to the first part by' a one-way clutch device in such manner that when the one part rotates with the shaft the other part is carried around with it but when said partis stopped the other is free to UVQF'I'HH and to continue to revolve owing to its own momentum.

Referring to the drawings igurei l. is a face view or elevation of a shutter according to this invention. Fig. 2. isa vertical section through same at 2, 2 in Fig. 1. Fig. 3. is a face view of the double inclined member forming part of the driving part of the shutters. Fig. is a similar View of the adjacent face of the driven part of the trolled plunger forming part of the oneway clutch mechanism.

In carrying this invention into practice as illustrated upon the accompanying drawings the shutter is in two main parts a and 7) The part a which is of a size approximately corresponding with one third of a complete disk 1?. e. 120 degrees is of a size adapted to intercept the light rays dur 'x. the time that the film is moving. This part a, is firmly secured to the driving shaft 0, he illustrated means for this being a split sleeve inside the hub 0 the split sleeve being contracted by the screws 0. The part 7) includes two sector shaped members 6 each of a size suflicient to prevent flickering. The part a and the part b are connected by a one-way clutch device in such manner that when the part a rotates it carries with it the part Z), the part 7) being supported upon the shaft by ball hearings in such manner that when the part 0, is stopped the part Z) will freely over-run. owing to its own momentum; i

As illustrated the part a is formed with a pair of inclines with shoulders a while the part b carries a. spring plunger (1 which is adapted to enter a recess a in the part a at a. point adjacent to the shoulder a thus connecting the casts a and 6 together so that when the part 11 rotates in the proper direc- I initial shock which takes place w en the plunger first strikes the shoulder.;

It will be seen from the drawing that the plunger is located at such a point in the part b that when it "engages the recess the part a covers the one part b and is diametrically opposite to the second part b sothat as the two parts rotate-they together-form a shutter of substantially orthodox form, e. a large sector for cutting off the light while the film is moved and a small sector at a joint diametricall opposite for preventing flickering of the lm.

When employing the shutter with cinematograph target apparatus having a motion arresting device as according to the prior Patent No. 1075894 the shutter a is so secure'd to the beater-shaft that it is moved at the same time as the film but as the shutter 6 will continue to revolve even after'the part a has been arrested a longer'time is 'tinue to revolve; for the purpose specified a one way clutch device; and a second' shutter member driven by the first shutter member through the medium of the one way clutch device; so arranged that when the motion of the first shutter member is arrested the second shutter member may conand substantially as set forth.

2. In. cinematograph target apparatus, the combination of a cinematograpli-having a shaft; a shutter member carried by said shaft and rotating and stopping therewith;

a second shutter member driven by the first shutter'member; a laterally disposed spring lunger carried by one of said shutter memers; and a pair of inclines carried by the other of said shutter members and co-actin with said plunger so as to cause the second shutter member to rotate with the first shutter member but permitting the second shutter member to over-run when the first is stopped; for the purpose set forth; 7 3. In 'cinemato raph target apparatus,"

the combination 0 a cinematograp having a shaft; a shutter member carried by said shaft and rotating and. stopping therewith;

a second shutter member driven by the-first v shutter'member; a laterally disposed spring.

plunger carried by oneof said shutter members; a pair of inclines carried by the other 7 5 of said. shutter members and co-acting with said plunger so as to cause the second shutter member to rotate with the first shutter member but permitting'the second shutter member to over-run when the first is stopped; and means for retaining tire. two shutter members in their correct relation when rotating; for the purpose 'set forth. 4. In cinematograph target apparatus, the combination of a cinematograp havin a shaft; a shutter member secured to sai shaftand being in the form bf a sector the sides of which make an angle relatively to each other of about 120 degrees; a second shutter member free to rotate upon said shaft and including two sector shaped and diametrically opposite portions, the sides of 1 each of which make an angle relatively to each other of about 60 degrees; a laterally disposed spring plunger carried by one of said shutter members; a pair of inclines carried by the other of said shutter members and co-acting with said plunger so as to. cause the second shutter member to rotate with the first shutter member'but permitting the second shutter member to over-run when'the first is stopped; and means for retaining the two shutter members in their correct relation when rotating; for the purposeset forth.

5.. In cinematograph target apparatus, the combination of a cinematograph havin a shaft; a shutter member secured tosai shaft and being in the form of a sector the sides of which make an angle relatively to each other of about degrees; a second shutter member free to revolve upon said shaft and including two sectorshaped and dimetrically opposite portions, the sides of each of which make an angle relatiyely to 116 each other of about 60 degrees; a laterally disposed spring plunger carried by one of said shutter members; a pair of inclines carried by the other of said shutter members and co-acting with said plunger so as to 12 0 cause the second shutter member to rotate wlth the first shutter member but permitting the second shutter member to over-run when the first is stopped; for the PQEPOSELIIWI set forth; 126

6. In cinematograph target apparatus,

the combination of a cinematograph having a shaft; a shutter member secured" to said In testimony whereof, wehave signed our names to this specification in the presence of two subscribing witnesses.

DOUGLAS HAYNES CORBIN. ARTHUR WILLIAM HARRIS.

itnesses as to Dou 'las Ha nes Corbin: b HAROLD J. C. BoRRns'rER, HERBERT J. O. BARTON.

\Vitnesses as to Arthur William Harris:

FRANK H. LOGAN,

W. H. BERRIGAN. 

